Re: [ATM] Re: RC with multiple primaries

[Dominic-Luc Webb <dlwebb@canit.se>]

Sorry, I think you misunderstood, maybe because I was not clear enough.
I do not mean to tilt either of the primaries for this purpose. In the
case of converging beams, there would be secondary and tertiary optical
components. One set could be fixed and the other would need to be
adjusted. The primaries would both be fixed in this case. I envision
several possible configurations, not necessarily using converging
beams. Indeed, some configurations do not even call for the mirrors to
be in close proximity.

Dominic-Luc Webb


On Wed, 17 Nov 2004, matt wrote:

> well, you'll need a longer winter than you have even in Sweden, because you
> can't just tip/tilt one mirror to match the fixed one. You'd also need to
> *flex* one mirror to match the other . You won't be using a simple quad cell
> but a large Shack Hartmann to measure the wavefront error and a vast number
> of power hungry and heat producing expensive actuators, with a huge amount
> of supporting electronics behind them . But a large array of DSP's or
> processors might come in handy to keep you warm until spring ;-)
>
> best regards,
> matt tudor
>
> -----Original Message-----
> From: Dominic-Luc Webb <dlwebb@canit.se>
> To: vladimir sacek <vladis.2@juno.com>
> Cc: atm@atmlist.net <atm@atmlist.net>
> Date: Wednesday, November 17, 2004 12:43 PM
> Subject: Re: [ATM] Re: RC with multiple primaries
>
>
> >
> >Now maybe my two cents worth.... I have been anticipating a multiple
> >mirror design. I recognize that collimation is a major limitation to
> >success. As many of you know, the lensless Schmidt is the design I
> >have been experimenting with the most recently. This design is by
> >and far the simplest of all designs, having only a single spherical
> >optical surface (the mirror). Collimation is a relatively brainless
> >exercise. I would think there are a few ways to put a couple of similarly
> >speced spherical mirrors together. For faint objects, I suppose if one
> >has a couple of separate detectors, it would be possible to run
> >correllative statistical comparisons of incoming signals to identify
> >signals from noise. Alternatively different filter sets might be used.
> >
> >Putting the two beams together in this design seems more straightforward.
> >I have considered the possibility of using mirrors mounted on speaker
> >attenuator coils to converge the beams and this would get feedback from
> >a CCD or PMT based imager. In this case, one mirror is generally fixed
> >and the other gets feedback such that divergence from the first mirror
> >is immediately compensated. I think this is not different from protocols
> >used for CCD guidance/tracking, which is now commonplace.
> >
> >To be honest, I have not yet found a serious application for this. I only
> >see it as an amusement to occupy my time indoors now that Winter is
> >hitting us up here in Sweden. If any of you experts in here want to
> >tear this idea apart or offer recommendations, now is a great time. The
> >case subject mirrors are  300 mm F/3.
> >
> >Dominic-Luc Webb
> >
> >
> >
> >_______________________________________________
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> >
>

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